The father say to his son, that’s his father in the photograph.
Answer:
Step-by-step explanation:
sec= x
cross multiply
60 mb x 2
120 mb/29 sec
The answer is <span>D. x=y-z-9/7</span>
The average speed is given by:
average speed=(total distance)/(total time)
total time for the first 30 miles was:
time=distance/speed
=30/30
=1 hr
total time for the remaining 30 miles
=30/60
=0.5
hence the average speed will be:
speed=(30+30)/(1+0.5)=60/1.5=40 miles per hour
